Tumor suppression was also observed for the MMTV-PyVT hematopoietic FAP+ cell depletion group (FAP-TK → MMTV) compared with a bone marrow transfer control group (Ly5.1 → MMTV) receiving GCV, and an untreated control group, although to a lesser degree compared to that of the stromal FAP+ cell depletion group (Figure 5E). Here, TKT is linked to neoplasm.